Process of producing mine-exploders.



No. 688,268. Patented Dec. 3, I901.

N. SCHMITT.

PROCESS OF PRODUCING MINE EXPLODEBS.

(Application filed Dec. 30, 1897.) (N o M u d e l.)

2 Sheets-Sheet l.

No. 688,268. Patented Dec. 3, I90I. N. SCHMITT.

PROCESS OF PRODUCING MINE EXPLDDEBS.

' (Application filed Dec. 30, 1897.) (N o M o d e l.)

2 Sheets-Sheet 2.

Eye 7] Z t Z /QZ l 512555195 Jaw]; Z07:- wm flww J TATES :ATENT Fries.

PROCESS OF PRODUCING MINE-EXPLODERS.

I SPECIFIGATIQIT forming part of Letters Patent No. 688,268, dated December 3, 1901.

Application filed December 30, 1897. Serial No. 664,782. (No specimens.)

.To allwhom, it may concern.-

Be it known that I, NICOLAUS SCHMITT, manufacturer, of Kiipperstig, in the German Empire, have invented a new and Improved Process of Producing Mine -Exploders, of which the following is a specification.

In the preparation of electric mine-fuses special regard should be paid to the following points: first, to use a cheap, sufficiently durable, and suitable insulating material; second, to eflectthe enveloping and insulating of the conductors by mechanical means in the cheapest possible way, but at the same time; third, to lay theends of the fuse-conductors that is, the fuse-points'always at the requisite equal distance from each other and in the simplest manner and to insure'this, if possible,

by the nature ofthe shaft itself, and, fourth, to simplify as far as possible the equipping of the fuse with the blast-capsule. A process and a machinein the working of which these points are kept in view are represented in the accompanying drawings, in which similar letters of reference denote similar parts throughout.

Figure-1 is a side elevation of the machine, partly in section, showing the left-hand end of the same; and Fig. l is a continuation of Fig.

1, showing the right-hand end of the machine;

Fig. 2, a detail elevation of the shaping-rolls on alarger scale; Fig. 3, a detail front elevation of the first drawing-plate; Fig. 4, a crosssection through the strip after it has passed through the said drawing-plate Fig. 5,a detail side-elevation of the drawing-rolls; Fig. 6,a detail front elevation of the guide-block for feeding the wires to the strip; Fig. 7, across-section through the strip with the Wires therein. Fig. 8 is an end elevation of the rolls through which the strip with the wires passes; Fig. 9, a similar elevation of the twisting-rolls; Fig. 10,,a side elevatioh of the finished cord with the fuse-head in section; Figs. 11 and12, crosssectious through a modified form of strip; Fig..13, a diagram of the opening of the shaping-plate to produce a cord of the cross-section shown at Fig. 11, and Fig. 14, an'end elevation of afeed-guide for four wires.

A strip of pasteboard of a certain width is unwound off the roller A and'formed by the pair of cylinders a, having the profile represented in Fig. 2, into the shape a. This pasteboard strip thus bent forward is in further course of process converted to a draw-plate Owing to the peculiar form of the openboard strip is drawn through the draw-plate B by means of the cylinders O, which are set in motion and which areqso shaped that the form of the cross-section, 'iflig. 4, of the pasteboard strip is preserved. r The pasteboard strip passes now into the vessel D, containing a size 'which is insoluble in water and to which at the same time may be added for its better insulation another'insulating substance or impregnating medium. The entrance and exit of the pasteboard strip into the vesselD is effected through the linings d and d", which also have the opening represented in Fig. 4. With some sorts of size which may beused it 'will be necessary to keep the bath warm, for

which the heating apparatus d serves. After leaving the'bath the pasteboard strip arrives at a second draw plate E, in which it is brought into contact with the conductors in the following manner:

w The draw-plate E (see Fig. 6) is provided with two guides e and e through whichthe conductors e and e are'led into the interior of the draw-plate E, the conductors coming from rollers e and e, which are attached at the side. The guides e e are so arranged in the draw-plate E that the conductors e e are led into the inner corners of the pasteboard strip. During the moving forward of the pasteboard strip, together with the conductors, the edges-0f the pastebo'ard strip in consequence of the gradual narrowing in of the draw-plateE up to its projecting circularshaped terminationget folded around the conductors, enveloping the latter completely.

In this way arises the circular full cross-cut.

(Shown in Fig, 7.) The conductors are thus perfectly insulated from each other andfrom without by the pa'steboard strip. By the strong pressure in the circular cross-cut'of the l footed from the draw-plate E.

drawplate E the conductors are pressed into the material of the pissteboard strip, so that a perfect closing is eifected. board strip leave any corners or odd portions of the conductors e not filled, they will be filled up by the size and impregnating substance which the pasteboard strip has carried with it from the bath D. Thus theaim is at tained--namely,that the condnctors,and consequently their termini where the sparks emanate, are kept im movably firm in their position. Just as the bath D requires under certain circumstances to be kept hot, so does also the drawplate E. After leaving the drawplate-E the newly-formed cord enters a pipeshaped heater F, Where it is dried. The cylinders G, whose profile is indicated in Fig. 8, perform -the drawing of the cord through the draw-plate E. The velocity of the circumference of the two pairs of cylinders O and Gr is so regulated that'G isslightly in advance in order to prevent the cord dragging or gettinginto foldsp In order to insure that the surfaces which have been stuck together byrthe size shall in no case be loosened, the smooth completed cylinder-shapedcord is seized by the rollers by means of the contrivance in- (licated at J (see Fig. 9) and at thesame time is pulled and firmlytwisted on its ownlongitudinal axis. The cord may, however, by suitable apparatus be wrapped round or spun or plaited round. Theseissors K on ts, either by hand or automatically, the endless cord into the required lengths.

\Vithout in the least altering the principle 5 the invention the machine may be made so as to leave out altogether the two cylinders G and effect the drawing of the cord by the draw-plate E by means of the pair of cylinders J, while at the same time the twisting is et- There may also bearranged behind the apparatus J, in front of the scissors K, a second-drying apparatus similar to F.

The further step in the preparation of the finished fuse, as illustratedin Fig. 10, is conducted in the usual simple manner. The cut lengths of the cord Z are provided with pasteboard cases Z in which the fuse mixture Z is placed, and on the pasteboard case Z is stuck the blast-capsule Z At the other end of the shaft Z the-conductors are bent upward from the pasteboard covering, which is cut openand tied in bows l, with which the electric-fuse battery is connected. The terminil of the conductors are in the case of Should the paste such as t-ragacanth, acacin gum, collodium,

orother suitable solution--and dipping the head therein, or by keeping'the binding medium and the powdered fuse mixture sepa-' rate and alternately dipping the head in thepowder and solution and applying it to the end of the strip 'whiledamp, after which it will harden to a fast fusehead.

In the same way as the embedding of two conductors e e in one pasteboard strip, as above described, is carried out, several conductors mayat pleasure be insulated from each other in a simple pasteboard strip and be enveloped together. Figs. 11 and 12 show cross-sections in which the above-described process is applied to four and six conductors, respectively. Of course in such cases the draw-plates and pairs of cylinders receive correspondingdilterentformsorprofiles. Fig. 13 represents, for example, thebackopening of the draw-plate B, and Fig. 1e the front View of the draw-plate E, with four conductors enveloped in one pasteboard strip.

In place of the pasteb'oard strip a strip of impregnated or non-impregnated linen, thick cloth, or thick paper, or anything similar may be used in the foregoing process.

Having now described my invention, what I claim, and desire to secure by Letters Patent, is 1 i A process for producing mine-exploders which consists in forming longitudinal creases in a strip of suitable material, impregnating the same material and feeding conductors into the said-creases in such manner as to keep the same insulated from each other, closing the said strip to a cord, drying the same and applying the fuse to the end thereof substantially as described. In testimony that I claim the foregoing as iny invention I have signed my name in presence of two subscribing witnesses. I

' NICOLAUS SCHMITT/ Witnesses:

M. IIERWIG, XV. GUMTAU. 

